PHYSICAL and CHEMICAL PROPERTIES

Concentrations of chemical constituents commonly found in rivers affect plant and animal life, as well as other water users. Figure 2.5 shows the typical concentrations of major ions found in large rivers of Minnesota at selected sampling sites. In addition to major ions, common metal, other elements and trace amounts of organic compounds from human activities are found in Minnesota’s rivers. Mercury, phosphorus, and polychlorinated biphenyls (PCBs) have been found in concentrations high enough to trigger concern for some rivers.

Figure 2.5 Average Concentrations of Major Ions Found in Minnesota Rivers. USGS NASQAN Station data, 1999.